Motion-picture apparatus



.AprilY 27, 1926.-

J MABETTE Menon PICTURE APPARATUS Filled septjza, 1921 INVENTOR'@ Tuccbues More his HTTOIRAIEYA Patented 'Apr. 27, 1926.

UNITED STATES PATENT OFFICE.

JACQUES MARETTE, OF -VINCENNE/S, FRANCE, ASSIGNOR 'IO PATHE CINEll/[A ANCIENS ETABLISSEMENTS PATHE FRERES, F PARIS, FRANCE.

MOTION' -PICTURE APPARATUS.

Application filed september 20,1921.l

To all w/z om t may concern.'

Be it known that I, JACQUES MARETrn, citizen of theFrench Republic2 residing at Vincennes, Seine, in the Republic of France,

5 have invented new and useful.' Improvements 1n Motion-Picture Apparatu following is a'specication.

vThis invention has for its object a motion picture apparatus for color cinematography,

s, of which. the

0 which comprises the combination of-a revsponding to an image and a -oluble disc carrying color screens for instance three)r and rotating by a revolutionl (for instance one-third) for each forward movement of the film correrevoluble shutter for cutting ofi' the light during the'shifting of the image and provided with'a single wing, the said shutter making one revolution for each forward movement of the'ilm corresponding to" an, image.

The said, shutter is preferably so disposed `as to cutoif the lig tas near as possible to the gate of the a paratus, and it has preferably the shape'o a truncated cone.

's disposition has the effect of reducingv to a minimum the period of obstruction of the light rays in order to obtain the maximum intensity either'when taking the views or when projecting the. same.

e accompanying drawing shows dia- 'grammatically and by way of exampleV a form of construction iiig the object of the ticular case in which of three series of monochromatic images 'intended to be projected successively through three suitable selecting color schemes.,

Fig, 1 is a general view ofthe device. Fig. 2 is a front view of the screenholder disc. Fig. 8 isa developedview of the trun- .cated cone shaped shutter. l

he device as applied to a projection apparatus comprises as for all the ordinary projection apparatus Va, source of' light disposed at a, a condenser 6, a shutter c and an aperture (Z -formed in a gate f wherein the film is displaced by intermittent movements affording the successive arrival of the images into the position coinciding with the aperture. This addition of a projection objective g.

a fraction ofY ofthe device constitutiiiventionin the par` the film 1s composed the details of I claim as new system 1s completed by the` serial No. 503,930.

In the case under consideration, the shutter employed c is a shutter having the shape of a truncated cone whose axis of rotation is oblique with reference to the axis 'mf-n of the optical system. This truncated cone shaped shutter is provided with 'a wing c1 which cuts possible to the aperture and during the time necessary for'the shifting vf the images.

This apparatus is also vprovided with a discc revoluble on an axis parallel to that of the opt-ical system and shifted with reference to the latter. This disc has three apertures vso disposed as to'allow thelight rays to pass through. tures is provided with a. transparent color screen z', 1, 2), the colors of the three screens being. complementary to each other.

The rotary, screen-holderv thus constituted while the shutthe rectilinear` generatrix of the truncated cpne shaped shutter will require a time three times as 'short as the radii of the screen-V holding ldisk for cutting across the beam of light. This device therefore permits to reduce toa minimum the wing of the shutter proper, 'and increases in the same degree the period of the' projection and consequently the amount of light on the screen.

The invention is of course not'limited to construction represented or described. v Havingnow described my invention, what and, desire to' secure by Letters Patent is:

In a motion pictures in colors permitting of taking views or projecting 1images the combination of a gate provi ded I with an aperture, a cinematographic film adapted to travel in an intermittentmanner in said gate so asto expose successively 'before said aperture each part of the film corresponding to an image, .a revoluble disc carrying a number of color screens and adapted to rotate through a off the light rays as near as picture apparatusV for motiony Each of these three aper-y corresponding :fraction of a revolution corresponding 'to a color screen at each movement of the lm corresponding to the feeding of .an image Aand a truncated cone' sh aped shutter adapted I to rotate. 'during a complete -revolutionof .said disc lthrough a number of revolutions equal to the number of screens in said' disc;

said shutter being. providedl with a single Wing corresponding to the height of an l image and coming close to the aperture in '10 

